Yugioh Zexal: Sakura story

Shark attack

Inside the Emperor Key:

After the Duel with Nelson, witnessing Sakura duel with Kaiden, the arrival of Anubis and the duel between Yuma and Cathy. Astral was seen floating down after he discover that on one of the center of a golden gear was a green-glowing number that represent one of the Number Cards that is currently in Astral possession. That Number was Number 83: Galaxy Queen, the Number that was formerly possessing Nelson Andrews aka The Sparrow 

Holding out his hand toward the glowing Number before him, he let out a smaller version of the Number, it began to shine brightly. It activate the gear before him as they  began to move as it was being brought back to life for the very first time. Astral began to take notes of this strange gizmo that seem to lead him to more questions, rather than answers

"This gear puzzle seem to move every time I recover one of the Ninety-nine Number Card? But why....?" Astral question himself on why the gears began to move when the Numbers were being brought back to the ship 

"Could it have something to do with my memory loss? Could solving this puzzle, also solve my amnesia?" He wonder to himself, "And what does Yuma have to do with it all? Why is this apparatus inside his key? And what is Sakura role in this?"

The scene then cut to outside, an airship with light green glowing and golden circle rails all over them made out of hundreds of gears appear. What is the purpose of the airship and will Astral solve the mystery puzzle to unlock his memories?

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Present:

"I made it..." Yuma announce as he finally enter the classroom with Sakura, who was waiting for him outside, at the entrance of the school, trying to catch his breath

"Afraid not..." Caswell said as he startled Yuma as Sakura glance over to see him, Tori and Bronk  walking over to the pair, before Caswell said, "Sakura maybe on time, but you're late, big time!"

"I'm not" Yuma protested as Caswell took Yuma deck as he fanned out his cards as the blue hair boy immediately began to check through his deck 

"Hmm. You are" Caswell replied to him

"Late how?" Yuma asked him 

"Late in explaining what's up with those Numbers Cards you play with?" Caswell said, just as Sakura narrow her eyes at him 

"Say what?" She said, before she glance over at Yuma, to which he flinch in his spot as he shake his head at her, Yuma turn his head to focus on Caswell. "If you means why they're not in my deck right now? That's a no-brainer"

"It is?" Caswell said, not believing him

"It is! They're only here when both Astral and Anubis are here" Tori answered 

"Hmm. And who is Astral? And who is Anubis?" Caswell interrogate Yuma, as Sakura look over behind him at Bronk and Tori, to which they both flinch and shudder in fear 

"You know what? It doesn't matter, in the end, it's clear why you're hiding them away. Because they're your secret weapons....what lets you win all the time" Caswell said 

"Hey! That not true at all!" Yuma said as he defend himself from Caswell. "Sure, I have some good cards, but the reason I win my matches.... is because I am a good duelist!"

"Yeah....sure it is? Come on, you could never defeated Shark or Flip without them....tell me I wrong?" Caswell said 

"You are so wrong" Sakura said, as the trio that consist of Tori, Bronk and Yuma all froze in fear and horror. Caswell slightly flinch when he noticed her angry, annoyed aura